The libavformat API is not suitable for exporting output devices as muxers.
Some practical problems are e.g. lack of timing/synchronization mechanisms
or interaction with output-specific features.

Fixes: 559/clusterfuzz-testcase-6424225917173760
Bug-Id: CVE-2017-7862
CC: libav-stable@libav.org

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 8c2ea303)
Signed-off-by: Diego Biurrun <diego@biurrun.de>

Since this machine type is 5 chars while the existing ones only
were 3 (which the regexp assumed), the regexp has to be extended
a little.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

On X86 windows, asflags weren't actually ever used for anything,
since assembling used x86asflags instead, and that flags list
had -DPIC already.

This fixes building shared libraries with clang for arm/aarch64
windows. (This wasn't an issue when in msvc mode before, since
we don't try to enable pic at all there, since the msvc armasm
assembler fails on our pic constructs there.)
Signed-off-by: Martin Storsjö <martin@martin.st>

We skipped adding it to cflags for mingw/cygwin configurations
where the compiler either complains loudly or even errors out;
do the same for target_os=win32, for the case when building with
clang in msvc mode.

This wasn't needed for the actual msvc before, since msvc uses
msvc_common_flags to filter out this flag from cflags.
When building with clang in msvc mode, no such filter is used.

This fixes building shared libraries with clang in msvc mode.
Signed-off-by: Martin Storsjö <martin@martin.st>

It does not represent a header but a complete system capability.

Also use that new capability to simplify bktr header checks.

This feature was never used for anything.

These extralibs are set by pkg-config already.

fork() is never used conditionally.

It should be sys/soundcard.h nowadays.

libgsm never installed more than a single header, the headers installed into
the gsm/ subdirectory by some distros are private. Who started this nonsense
is a mystery, but it got cargo-culted around ever since.

We already rely on just mmap() in other places.

It is detected as a part of the ID3D11VideoDecoder check.

It is detected as a part of the libdl check.

The variable lists are for variables whose values end up in output files.

This proprietary Unix flavor dropped from the face of the earth more
than a decade ago. Nothing of value was lost.

Build h2645_parse.o with it, as every hevc_ps dependency also needs it.
This is more in line with h264's h264parse module.
Signed-off-by: James Almer <jamrial@gmail.com>

ret is 0 by default.
Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Removes the extra code to preserve global CFLAGS.
Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Diego Biurrun <diego@biurrun.de>

This helper is split off check_pkg_config(), setting only the pkg CFLAGS
and extralibs. This is useful for checks that do not require or do not
benefit from setting global CFLAGS.
Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Diego Biurrun <diego@biurrun.de>

It exists as an alias for string.h in most C libraries, so usually this
line is harmless.

Should improve the performance on multiple transcoding from a single
source.

It is needed to have the calls to MFXJoinSession succeed.

Signed-off-by: Martin Storsjö <martin@martin.st>

Use the appropriate metadata filter for each codec - in the absence of any
options to modify the stream, the output bitstream should be identical to
the input (though the output file may differ in padding).

All tests use conformance bitstreams, the MPEG-2 streams are newly added
from the conformance test streams
<http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_13818-4_2004_Conformance_Testing/Video/>